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Simulation of precipitation of secondary carbides in hot work tool steels
RISE, Swerea, Swerea KIMAB.
2012 (English)In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 28, no 3, p. 288-294Article in journal (Refereed)
Abstract [en]

Precipitation of secondary carbides in hot work tool steels during tempering heat treatments has been investigated using simulations based on a thermodynamic description coupled with kinetic parameters through multicomponent nucleation and growth models. The simulations reproduce the measured effects of steel composition on the precipitation of secondary carbides. Both Si and V increase the volume fraction of fine secondary carbides precipitated during tempering provided that the austenitising temperature is adjusted to give the same fraction of retained primary carbides. The most important effect of Si in 5%Cr steels is its influence on the primary carbide stability at austenitisation temperatures, but increasing the V contents has a strong effect on the fraction of secondary carbides, without increasing the size, and can thus improve the yield strength. The most critical input to the calculations is the thermodynamic description of the individual phases. © 2012 Institute of Materials, Minerals and Mining.

Place, publisher, year, edition, pages
2012. Vol. 28, no 3, p. 288-294
Keywords [en]
Hot work tool steel, Modelling, Precipitation, Secondary carbides
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12842DOI: 10.1179/1743284711Y.0000000034Scopus ID: 2-s2.0-84857295702OAI: oai:DiVA.org:ri-12842DiVA, id: diva2:973035
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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